package main

import (
	"flag"
	"fmt"
	"strings"
)

var n = flag.Bool("n", false, "omit")
var sep = flag.String("s", " ", "sep")

func main() {
	flag.Parse()
	//使用指针取命令行中输入的分隔值
	fmt.Printf(strings.Join(flag.Args(), *sep))
	if *n {
		fmt.Println("n")
	}
}
